Erbslöh Aluminium GmbH

General Information (Micro-Multiport / MMP and Multiport / MP Tubes)

Quality testing method

Our inspections and quality testing are carried out according to the rules of our quality manual,

which has been certified according to DIN EN ISO 9001 and TS16949 : 2002.

Additional product inspection capabilities are among others

• laser surface roughness test

• burst pressure test

• x-ray fluorescence analysis for zinc coating amount

• mechanical tensile test

Alloy Properties

EA1110 (AA1100)

EA3041 (AA3102)

EA3061

EA3065

EA3051

EA3152

EA3556

EA3122

EA3085

–735mV

–730mV

–721mV

–716mV

–701mV

–713mV

–713mV

–729mV

–733mV

Designation of Erbslöh

Aluminium GmbHISO

Alloys Typical Post Braze Properties* Free Corrosion Potential (mV) on bare tube**

* Based on EAL standard lab brazing cycle. ** Based on EAL standard lab brazing cycle. According to ASTM G69, possible deviation +/-5mV.

Erbslöh Aluminium GmbH Heat Transfer Division

AlCu0.1

AlMn0.4

AlMn0.7

AlMn0.8

AlMn0.2Cu0.4

AlMn0.6Cu0.2

AlMn0.6Cu0.2

AlMn0.9

AlMn0.8

min. 10

min. 20

min. 20

min. 20

min. 20

min. 20

min. 35

min. 20

min. 35

Yield Strength[MPa]

Tensile Strength[MPa]

min. 60

min. 60

min. 70

min. 70

min. 70

min. 70

min. 70

min. 80

min. 90

Coiled material• returnable bobbins with steel pallets or• one-way-bobbins with wooden pallets

Random-length-packaging• wooden boxes• steel racks

CTL-packaging

Returnable box pallets with wooden collapsable frames

Returnable wooden CLIP-boxes(collapsable)

two different versions /outer dimensions:• 800 x 600 mm

• 800 x 1200 mm

Packaging

Erbslöh Aluminium GmbH Heat Transfer Division

General Information (Micro-Multiport / MMP and Multiport / MP Tubes)

Coil standard sizes

Inner diametre (DI): min. 500 mm

Outer diametre (DA): to be agreed

Over all width (BA): to be agreed

Mandrel diametre (da): 131 mm

Coil weight: to be agreed

Coil width BA over all

DI da

140

DA

1200800

28

Erbslöh Aluminium GmbH Heat Transfer Division

Micro-Multiport (MMP) Tubes

Profile Shape

C

A

D

E

B

Dimensions and tolerances for coiled tubes (in mm)

Dimensions Minimum Maximum Tolerance

A

B

C

D

6.00

0.90

0.25

0.15

25.00

4.50

1.00

1.00

± 0.05

± 0.05

± 0.05

± 0.05

Dimensions and tolerances for cut-to-length material (in mm)

Dimensions Minimum Maximum Tolerance

A

B

C

D

E

10.00

0.90

0.25

0.15

200.00

25.00

4.50

1.00

1.00

1100.00

± 0.05 (± 0.08 cpk >1.67)

± 0.01 (± 0.03 cpk >1.67)

± 0.05

± 0.05

± 0.30 (± 0.50 cpk >1.67)

Erbslöh Aluminium GmbH Heat Transfer Division

Micro-Multiport (MMP) Tubes

Cut-to-length

Surface

• surface roughness Ry below 15 μm for the bare tube• zinc coated with arc spray from 5+/-2 g/m2 up to 15+/-3 g/m2

• FLUX-coated tubes

0.1

1/1000

H

Camber, Bow and Flatness

Camber 1 mm / 1000 mm:

Bow 1 mm / 1000 mm:

Flatness 0.1 mm:

Roller cut

Roller cut (chip free)

Endcoining

The measurement of the whole tube length has to be defined

including the length extension caused by the cutting process.

ADVANTAGES:

• optimized tube-header joint

• fixed penetry depth in the header slot

• better assembly behaviour

One StepEndcoining

Two StepEndcoining

Filler Metal Flow Barrier

ΔL= x mm (depending on the geometry)

ΔH= x mm (depending onthe geometry)

1/1000

Erbslöh Aluminium GmbH Heat Transfer Division

Multiport (MP) Tubes

Profile Shape

C

A

D

E

B

Dimensions and tolerances for coiled tubes (in mm)

Dimensions Minimum Maximum Tolerance

A

B

C

D

25.00

1.50

0.30

0.15

100.00

10.50

1.00

1.00

± 0.10 – 0.15

± 0.05

± 0.05

± 0.05

Dimensions and tolerances for cut-to-length material (in mm)

Dimensions Minimum Maximum Tolerance

A

B

C

D

E

25.00

1.50

0.30

0.15

200.00

100.00

10.00

1.00

1.00

1100.00

± 0.10 – 0.15

± 0.03 – 0.05

± 0.05 – 0.10

± 0.05

± 0.50 – 1.00

Erbslöh Aluminium GmbH Heat Transfer Division

Multiport (MP) Tubes

Cut-to-length

Surface

• surface roughness Ry below 15 μm for the bare tube• FLUX-coated tubes

0.1

1/1000

H

Camber, Bow and Flatness

Camber 1 mm / 1000 mm:

Bow 1 mm / 1000 mm:

Flatness 0.1 mm:

Roller cut

Roller cut (chip free)

Endcoining

The measurement of the whole tube length has to be defined

including the length extension caused by the cutting process.

ADVANTAGES:

• optimized tube-header joint

• fixed penetry depth in the header slot

• better assembly behaviour

One StepEndcoining

Two StepEndcoining

Filler Metal Flow Barrier

ΔL= x mm (depending on the geometry)

ΔH= x mm (depending onthe geometry)

Sawed cut (for random length)

1/1000

Erbslöh Aluminium GmbH Heat Transfer Division

Filler Metal Flow Barrier

Introduction

Since the introduction of extruded multiport tubes for the manufacturing of parallel flow condensers in the CAB-process a

lot of efforts have been made to reduce the risk of brazing erosion.

Brazing erosion

Brazing erosion is driven by the fundamental parameters time and temperature {Ref.1}*. On extruded tubes, brazing

erosion can be accelerated by preferential filler metal flow from the header to the fins along the longitudinal extrusion

lines (Pic. 1).

This effect is critical to the essential quality properties, such as burst pressure, pressure cycle resistance and corrosion

resistance (Pic. 2). The detection of critical heat exchangers is not guaranteed by the common process control methods.

* {Ref.1} Solvay "Filler Metal Management in NOCOLOK Flux Brazing of Aluminum"

Pic. 1:Brazing erosion along extrusion lines. Note: Erosion is limited to the area between header and fins.

Pic. 2:Filler metal erosion reduces the wall thickness of the outer wall.

Erbslöh Aluminium GmbH Heat Transfer Division

Filler Metal Flow Barrier

Filler Metal Flow Barrier

A new process is introduced by ERBSLÖH to reduce the risk of brazing erosion accelerated by extrusion lines. A fil-

ler metal flow barrier is formed in the space between header and fins (Pic. 4). The filler metal flow barrier (FMFB) is

designed as a groove that is perpendicular to the extrusion lines (EL).

Examples of a post brazed condenser

Note:

• Burst pressure resistance or pressure cycle resistance is not reduced (Pic. 3).

• Internal flow area is not reduced (Pic. 3).

• Corrosion resistance given by a sacrificial zinc layer is not affected (Pic. 5).

• The forming process is chipless and does not affect internal cleanliness.

Advantages

• The groove design and position can be adapted to customers needs.

• Preferential filler metal flow from header to fins is reduced by interruption of extrusion lines. Filler metal fills the gaps and not the fins.

• Quality failure risk (internal/external) is reduced.

• Surface roughness limits can be set to a reasonable level.

• FMFB allows wider brazing window to improve tube-to-header leakage rate.

• No extra costs!

Pic. 3: Example of filler metal flow barrier (cross section.)

Pic. 4: Example of filler metal flow barrier (SEM-top view).

Pic. 5: Zn-element mapping (SEM). Same area as Pic. 4.

Pic. 6a: Example of the effect of the filler metal flow barrier on a post brazed condenser.

Pic. 6b: Detail view of Pic. 6a

EL

FMFB

Siebeneicker Straße 23542553 Velbert

Postanschrift/Postal AddressPostfach/P.O. Box 15 01 60

42520 Velbert

Tel +49 2053 95-1200Fax +49 2053 95-2200